| 1 |
1026 |
ivang |
/*
|
| 2 |
|
|
**************************************************************************
|
| 3 |
|
|
*
|
| 4 |
|
|
* Component =
|
| 5 |
|
|
*
|
| 6 |
|
|
* Synopsis = rdbg/i386/excep.c
|
| 7 |
|
|
*
|
| 8 |
|
|
* excep_f.c,v 1.2 2002/02/01 17:00:01 joel Exp
|
| 9 |
|
|
*
|
| 10 |
|
|
**************************************************************************
|
| 11 |
|
|
*/
|
| 12 |
|
|
|
| 13 |
|
|
#include <rtems.h>
|
| 14 |
|
|
#include <rtems/error.h>
|
| 15 |
|
|
#include <assert.h>
|
| 16 |
|
|
#include <errno.h>
|
| 17 |
|
|
#include <rdbg/rdbg.h>
|
| 18 |
|
|
#include <rdbg/servrpc.h>
|
| 19 |
|
|
|
| 20 |
|
|
/* -----------------------------------------------------------------
|
| 21 |
|
|
Maping of hardware exceptions into Unix-like signal numbers.
|
| 22 |
|
|
It is identical to the one used by the PM and the AM.
|
| 23 |
|
|
----------------------------------------------------------------- */
|
| 24 |
|
|
|
| 25 |
|
|
int
|
| 26 |
|
|
ExcepToSig (Exception_context * ctx)
|
| 27 |
|
|
{
|
| 28 |
|
|
int excep = getExcNum (ctx);
|
| 29 |
|
|
|
| 30 |
|
|
switch (excep) {
|
| 31 |
|
|
|
| 32 |
|
|
case I386_EXCEPTION_MATH_COPROC_UNAVAIL:
|
| 33 |
|
|
case I386_EXCEPTION_I386_COPROC_SEG_ERR:
|
| 34 |
|
|
case I386_EXCEPTION_FLOAT_ERROR:
|
| 35 |
|
|
case I386_EXCEPTION_BOUND:
|
| 36 |
|
|
return SIGFPE;
|
| 37 |
|
|
|
| 38 |
|
|
case I386_EXCEPTION_DEBUG:
|
| 39 |
|
|
case I386_EXCEPTION_BREAKPOINT:
|
| 40 |
|
|
case I386_EXCEPTION_ENTER_RDBG:
|
| 41 |
|
|
return SIGTRAP;
|
| 42 |
|
|
|
| 43 |
|
|
case I386_EXCEPTION_OVERFLOW:
|
| 44 |
|
|
case I386_EXCEPTION_DIVIDE_BY_ZERO:
|
| 45 |
|
|
case I386_EXCEPTION_ILLEGAL_INSTR:
|
| 46 |
|
|
return SIGILL;
|
| 47 |
|
|
|
| 48 |
|
|
case I386_EXCEPTION_SEGMENT_NOT_PRESENT:
|
| 49 |
|
|
case I386_EXCEPTION_STACK_SEGMENT_FAULT:
|
| 50 |
|
|
case I386_EXCEPTION_GENERAL_PROT_ERR:
|
| 51 |
|
|
case I386_EXCEPTION_PAGE_FAULT:
|
| 52 |
|
|
return SIGSEGV;
|
| 53 |
|
|
|
| 54 |
|
|
default:
|
| 55 |
|
|
break;
|
| 56 |
|
|
}
|
| 57 |
|
|
return SIGKILL;
|
| 58 |
|
|
}
|
| 59 |
|
|
|
| 60 |
|
|
/*----- Breakpoint Exception management -----*/
|
| 61 |
|
|
|
| 62 |
|
|
/*
|
| 63 |
|
|
* Handler for Breakpoint Exceptions :
|
| 64 |
|
|
* software breakpoints.
|
| 65 |
|
|
*/
|
| 66 |
|
|
|
| 67 |
|
|
void
|
| 68 |
|
|
BreakPointExcHdl (CPU_Exception_frame * ctx)
|
| 69 |
|
|
{
|
| 70 |
|
|
rtems_status_code status;
|
| 71 |
|
|
rtems_id continueSemId;
|
| 72 |
|
|
|
| 73 |
|
|
if ((justSaveContext) && (ctx->idtIndex == I386_EXCEPTION_ENTER_RDBG)) {
|
| 74 |
|
|
PushSavedExceptCtx (_Thread_Executing->Object.id, ctx);
|
| 75 |
|
|
justSaveContext = 0;
|
| 76 |
|
|
} else {
|
| 77 |
|
|
if (ctx->idtIndex != I386_EXCEPTION_DEBUG) {
|
| 78 |
|
|
NbSerializedCtx++;
|
| 79 |
|
|
rtems_semaphore_obtain (serializeSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
|
| 80 |
|
|
NbSerializedCtx--;
|
| 81 |
|
|
}
|
| 82 |
|
|
|
| 83 |
|
|
currentTargetThread = _Thread_Executing->Object.id;
|
| 84 |
|
|
|
| 85 |
|
|
#ifdef DDEBUG
|
| 86 |
|
|
printk ("----------------------------------------------------------\n");
|
| 87 |
|
|
printk ("Exception %d caught at PC %x by thread %d\n",
|
| 88 |
|
|
ctx->idtIndex, ctx->eip, _Thread_Executing->Object.id);
|
| 89 |
|
|
printk ("----------------------------------------------------------\n");
|
| 90 |
|
|
printk ("Processor execution context at time of the fault was :\n");
|
| 91 |
|
|
printk ("----------------------------------------------------------\n");
|
| 92 |
|
|
printk (" EAX = %x EBX = %x ECX = %x EDX = %x\n",
|
| 93 |
|
|
ctx->eax, ctx->ebx, ctx->ecx, ctx->edx);
|
| 94 |
|
|
printk (" ESI = %x EDI = %x EBP = %x ESP = %x\n",
|
| 95 |
|
|
ctx->esi, ctx->edi, ctx->ebp, ctx->esp0);
|
| 96 |
|
|
printk ("----------------------------------------------------------\n");
|
| 97 |
|
|
printk ("Error code pushed by processor itself (if not 0) = %x\n",
|
| 98 |
|
|
ctx->faultCode);
|
| 99 |
|
|
printk ("----------------------------------------------------------\n\n");
|
| 100 |
|
|
#endif
|
| 101 |
|
|
|
| 102 |
|
|
status = rtems_semaphore_create (rtems_build_name ('D', 'B', 'G', 'c'),
|
| 103 |
|
|
0,
|
| 104 |
|
|
RTEMS_FIFO |
|
| 105 |
|
|
RTEMS_COUNTING_SEMAPHORE |
|
| 106 |
|
|
RTEMS_NO_INHERIT_PRIORITY |
|
| 107 |
|
|
RTEMS_NO_PRIORITY_CEILING |
|
| 108 |
|
|
RTEMS_LOCAL, 0, &continueSemId);
|
| 109 |
|
|
if (status != RTEMS_SUCCESSFUL)
|
| 110 |
|
|
rtems_panic ("Can't create continue semaphore: `%s'\n",
|
| 111 |
|
|
rtems_status_text (status));
|
| 112 |
|
|
|
| 113 |
|
|
PushExceptCtx (_Thread_Executing->Object.id, continueSemId, ctx);
|
| 114 |
|
|
|
| 115 |
|
|
switch (ctx->idtIndex) {
|
| 116 |
|
|
case I386_EXCEPTION_DEBUG:
|
| 117 |
|
|
DPRINTF ((" DEBUG EXCEPTION !!!\n"));
|
| 118 |
|
|
ctx->eflags &= ~EFLAGS_TF;
|
| 119 |
|
|
ExitForSingleStep--;
|
| 120 |
|
|
rtems_semaphore_release (wakeupEventSemId);
|
| 121 |
|
|
break;
|
| 122 |
|
|
|
| 123 |
|
|
case I386_EXCEPTION_BREAKPOINT:
|
| 124 |
|
|
DPRINTF ((" BREAKPOINT EXCEPTION !!!\n"));
|
| 125 |
|
|
rtems_semaphore_release (wakeupEventSemId);
|
| 126 |
|
|
break;
|
| 127 |
|
|
|
| 128 |
|
|
case I386_EXCEPTION_ENTER_RDBG:
|
| 129 |
|
|
DPRINTF ((" ENTER RDBG !!!\n"));
|
| 130 |
|
|
rtems_semaphore_release (wakeupEventSemId);
|
| 131 |
|
|
break;
|
| 132 |
|
|
|
| 133 |
|
|
default:
|
| 134 |
|
|
DPRINTF ((" OTHER EXCEPTION !!!\n"));
|
| 135 |
|
|
rtems_semaphore_release (wakeupEventSemId);
|
| 136 |
|
|
break;
|
| 137 |
|
|
}
|
| 138 |
|
|
|
| 139 |
|
|
rtems_semaphore_obtain (continueSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
|
| 140 |
|
|
|
| 141 |
|
|
PopExceptCtx (_Thread_Executing->Object.id);
|
| 142 |
|
|
rtems_semaphore_delete (continueSemId);
|
| 143 |
|
|
}
|
| 144 |
|
|
}
|
